Data from: Loss of genetic diversity, recovery, and allele surfing in a colonizing parasite, Geomydoecus aurei
Demastes, James W., University of Northern Iowa
Hafner, David J., University of New Mexico
Hafner, Mark S., Louisiana State University of Alexandria
Light, Jessica E., Texas A&M University
Spradling, Theresa A., University of Northern Iowa
Published Dec 19, 2018 on Dryad.
Cite this dataset
Demastes, James W. et al. (2018). Data from: Loss of genetic diversity, recovery, and allele surfing in a colonizing parasite, Geomydoecus aurei [Dataset]. Dryad. https://doi.org/10.5061/dryad.63p479j
Understanding the genetic consequences of changes in species distributions has wide-ranging implications for predicting future outcomes of climate change, for protecting threatened or endangered populations, and for understanding the history that has led to current genetic patterns within species. Herein, we examine the genetic consequences of range expansion over a 25-year period in a parasite (Geomydoecus aurei) that is in the process of expanding its geographic range via invasion of a novel host. By sampling the genetics of 1,935 G. aurei lice taken from 64 host individuals collected over this time period using 12 microsatellite markers, we test hypotheses concerning linear spatial expansion, genetic recovery time, and allele surfing. We find evidence of decreasing allelic richness with increasing distance from the source population, supporting a linear, stepping stone model of spatial expansion that emphasizes the effects of repeated bottleneck events during colonization. We provide evidence of post-bottleneck genetic recovery, with average allelic richness of infrapopulations increasing about 30% over the 225-generation span of time observed directly in this study. Our estimates of recovery rate suggest, however, that recovery has plateaued, and that this population may not reach genetic diversity levels of the source population without further immigration from the source population. Finally, we employ a grid-based sampling scheme in the region of ongoing population expansion and provide empirical evidence for the power of allele surfing to impart genetic structure on a population, even under conditions of selective neutrality and in a place that lacks strong barriers to gene flow.
Specimens table with localities final analyses
Specimen table with voucher numbers and localities as given in publication. Excel format.
Msat data for 64 infrapopulations 60 in Molecular Ecology paper + 4 from primer note
Raw microsatellite data given by specimen with allele sizes in base pairs
Allele freq Geomydoecus 12 loci 64 infrapop Allele freq no headers
Louse allele frequencies for 12 microsatellite loci
R scripts for DRYAD
R scripts used in analyses
34 gophers GenePop
34 gophers GenePop file (34 = all gophers south of the San Acacia constriction)
39 gophers GenePop
39 gophers GenePop file (39 gophers = north and south of San Acacia Constriction combined)
39 gophers Bfib
Beta-fibrinogen gene sequence alignments for 39 gophers
39 gophers COI
COI gene sequence alignments for 39 gophers
39 gophers IRBP
IRBP gene sequence alignments for 39 pocket gophers
39 gophers Rag1
Rag1 gene sequence alignments for 39 gophers
34 2016 gophers 4 genes 3 pops.structure
Structure input file for 34 gophers from south of San Acacia constriction. Population names correspond with louse genetic groups.
39 2016 gophers 4 genes 3 pops.structure
Structure input file for 39 gophers from north and south of San Acacia constriction. Population names correspond with louse genetic groups. Mitochondrial alleles are coded with one missing allele per individual.
GenePop file for lice north of the San Acacia constriction
34 louse infrapopulationsGenePop
Louse GenePop file for 34 2016-infrapopulations of lice from south of San Acacia constriction